ligo.skymap welcomes code contributions and issue reports. The ligo.skymap project lives on git.ligo.org, the LIGO Scientific Collaboration's and Virgo Collaboration's GitLab instance. Contributors that are members of LIGO, Virgo, or KAGRA and have a @ligo.org email address should submit issues and merge requests through the GitLab project page at https://git.ligo.org/lscsoft/ligo.skymap.
Contributors who are not members of LIGO, Virgo, or KAGRA can submit issues or pull requests through the project's GitHub mirror at https://github.com/lpsinger/ligo.skymap.